IB ACIO Grade II practice question
A racer car covers the first 160 km at a speed of 80 km/hr, another 160 km at 120 km/hr and the last 160 km at 80 km/hr. Find out average speed of the racer car for the entire journey.
From a IB ACIO Grade II General Awareness practice set · General Awareness
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Correct answer: (A) 90 km/hr
For equal distances (160 km each) at 80, 120 and 80 km/hr, total time = 160/80 + 160/120 + 160/80 = 2 + 1.333 + 2 = 5.333 hr. Average speed = 480/5.333 = 90 km/hr.
हिंदी में प्रश्न
एक रेिसंग कार पहले 160 km की दूरी 80 km/hr की चाल से , अगले 160 km की दूरी 120 km/hr की चाल से और अंितम 160 km की दूरी 80 km/hr की चाल से तय करती है। संपूण यात्रा के िलए रेिसंग कार की औसत चाल ात कीिजए।
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सही उत्तर: (A) 90 km/hr
बराबर दूरी (160-160 किमी) पर 80, 120 और 80 किमी/घं की गति से कुल समय = 160/80 + 160/120 + 160/80 = 2 + 1.333 + 2 = 5.333 घंटे। औसत गति = 480/5.333 = 90 किमी/घं।
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